There are a few things to consider with this type of problem.
How old are the batteries. When did you last have them tested. Is the charger output ok on load (test with an amp clamp type meter). is the charger the correct one for these batteries, small output chargers take longer to charge big batteries. Are all connection tight on batteries and anything to do with the charging circuit. Plug and socket type connection do fail on poor connections. Check voltage on batteries when on charge and off charge to see if the charger voltage is getting through to the batteries.
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